CVE-2017-8631: Microsoft Excel

High severity, CVSS 7.8. EPSS: 17% chance of exploitation in the next 30 days.

A remote code execution vulnerability exists in Excel Services, Microsoft Excel 2007 Service Pack 3, Microsoft Excel 2010 Service Pack 2, Microsoft Excel 2013 Service Pack 1, Microsoft Excel 2013 RT Service Pack 1, Microsoft Excel 2016, Microsoft Office Web Apps 2013, Microsoft Office Compatibility Pack Service Pack 3, Microsoft Excel Web App 2013 Service Pack 1, Microsoft Excel Viewer 2007 Service Pack 3, and Office Online Server when they fail to properly handle objects in memory, aka "Microsoft Office Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-8630, CVE-2017-8632, and CVE-2017-8744.

Affected products

• Microsoft Excel: version 2007 only; version 2010 only; version 2013 only; version 2016 only
• Microsoft Excel Viewer: version 2007 only
• Microsoft Excel Web App: version 2013 only
• Microsoft Office Compatibility Pack: affected versions not specified
• Microsoft Office Online Server: any version
• Microsoft Office Web Apps: version 2013 only

Published 2017-09-13. Last modified 2026-06-17.